Benefits & Results

What benefits can I expect from One A Day?

One A Day contains 11 EU-authorised health claims across the areas men care about most. The nutrients in this formula contribute to normal mental performance, cognitive function, and psychological function. They contribute to the reduction of tiredness and fatigue and to normal energy-yielding metabolism.

  • Zinc contributes to the maintenance of normal testosterone levels.

  • Vitamin D contributes to normal muscle function and the maintenance of normal bones.

  • Vitamin D, vitamin C, selenium and zinc contribute to the normal function of the immune system.

  • Biotin contributes to the maintenance of normal hair and skin.

These are not marketing claims. They are EU-authorised health claims backed by the specific nutrients in this formula at their stated doses.

How long until I notice a difference?

Results vary between individuals depending on your baseline nutrient status, diet, and lifestyle. That said, here is a realistic general timeline based on how the nutrients in this formula work.

Weeks 1 to 2: Water-soluble B-vitamins replenish relatively quickly with consistent daily intake.

Weeks 3 to 6: Magnesium and zinc stores may begin normalising. Research associates adequate magnesium status with improved stress resilience.

Months 2 to 6: Studies on zinc supplementation in men with low zinc status have measured changes in testosterone markers after 3 to 6 months of consistent intake.

One A Day is a daily nutritional supplement, not a fast-acting product. The benefits come from consistent use over time, not a single dose. Give it at least 60 days of daily use before drawing conclusions.

What are the authorised health claims for this product?

One A Day carries 11 EU-authorised health claims. These are regulated claims that can only be made when a product contains the relevant nutrient at the required level. Here is the full list:

  1. Pantothenic acid contributes to normal mental performance.

  2. Zinc and iodine contribute to normal cognitive function.

  3. Zinc contributes to the maintenance of normal testosterone levels.

  4. Vitamins B2, B3, B6, B12, vitamin C and magnesium contribute to the reduction of tiredness and fatigue.

  5. Magnesium contributes to normal psychological function.

  6. Vitamin D and vitamin K contribute to the maintenance of normal bones.

  7. Vitamin D contributes to normal muscle function.

  8. Vitamin D, vitamin C, selenium and zinc contribute to the normal function of the immune system.

  9. Selenium contributes to normal spermatogenesis.

  10. Vitamin C, vitamin E and selenium contribute to the protection of cells from oxidative stress.

  11. Biotin contributes to the maintenance of normal hair and skin.

Do I need other supplements if I take One A Day?

For most men, One A Day covers the core daily nutritional foundation without needing additional single-nutrient supplements. It includes vitamin D3 at 500% NRV, a full B-complex, zinc, magnesium, selenium, iodine, copper, vitamins C, E, K2 and beta-carotene. If you are currently taking a separate vitamin D, B12, zinc, or magnesium supplement, One A Day may already cover those.

Before adding anything to your stack, check your other labels against the One A Day ingredient list to avoid doubling up on any single nutrient.

Still have a question? Contact our team at support@mentools.co and we'll get back to you within 24 to 48 hours.